High-energy laser semi-integrating-sphere array attenuator

Abstract

The invention provides a high-energy laser semi-integrating-sphere array attenuator, which comprises a front panel arranged along a laser incident direction, a back panel and a plurality of attenuation units, wherein the attenuation units comprise wide-angle sampling taper holes arranged on the front panel, semi-sphere cavities arranged on the back panel, and laser emergent holes which are arranged on the edges of the semi-sphere cavities and are vertical to the back panel; the positions of the wide-angle sampling taper holes are corresponding to the positions of the semi-sphere cavities one to one; and the wide-angle sampling taper holes and the laser emergent holes are respectively arranged on the two sides of the semi-integrating-sphere cavities. In the attenuator provided by the invention, laser is coupled into the semi-sphere cavities via the wide-angle sampling taper holes, is absorbed and diffuse-reflected by the semi-sphere cavities, and then is ejected from the laser emergentholes, large amplitude attenuation of laser power density is realized, and the requirement of attenuation sampling during oblique incidence of the laser can be satisfied.

Description

Technical field [0001] The invention relates to an array attenuator for high-energy lasers, in particular to a semi-integrating sphere array attenuator for high-energy lasers. Background technique [0002] In the measurement of high-energy laser parameters, the photodetector array sampling method is often used to obtain the spatial-temporal distribution information of the laser spot power density. Because the laser power density at the test location is generally high, it is difficult to directly use the photodetector array to measure, so in actual testing, the measured laser power density needs to be reasonably attenuated to meet the range of the photodetector range. The ideal optical attenuation method should be independent of the incident laser wavelength, incident angle, polarization state and other parameters, and only attenuate the incident laser amplitude accordingly, and the attenuation is linear within a certain range. [0003] At present, the commonly used optical attenu...

AI Technical Summary

Problems solved by technology

The problem with this kind of attenuator is that it is difficult to measure the parameters when the strong laser is obliquely incident. When the laser enters the laser incident hole at a certain angle, the hole wall of the graphite material has a high absorption of the laser light, and it corresponds to different incidents. The absorption coefficient of the hole wall to the incident laser varies greatly when the angle is different, so it is difficult to use the laser light intensity attenuation and parameter measurement when the angle is incident, which limits the application range of this method

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